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• W4280498512 abstract "Abstract LARGE1 is a bifunctional glycosyltransferase responsible for generating a long linear polysaccharide termed matriglycan that links the cytoskeleton and the extracellular matrix and is required for proper muscle function. This matriglycan polymer is made with an alternating pattern of xylose and glucuronic acid monomers. Mutations in the LARGE1 gene have been shown to cause life-threatening dystroglycanopathies through the inhibition of matriglycan synthesis. Despite its major role in muscle maintenance, the structure of the LARGE1 enzyme and how it assembles in the Golgi are unknown. Here we present the structure of LARGE1, obtained by a combination of X-ray crystallography and single-particle cryo-EM. We found that LARGE1 homo-dimerizes in a configuration that is dictated by its coiled-coil stem domain. The structure shows that this enzyme has two canonical GT-A folds with each of its catalytic domains. In the context of its dimeric structure, the two types of catalytic domains are brought into close proximity from opposing monomers to allow efficient shuttling of the substrate between the two domains. Together with putative retention of matriglycan by electrostatic interactions, this dimeric organization offers a possible mechanism for the high processivity of LARGE1. The structural information further reveals the mechanisms in which disease-causing mutations disrupt the activity of LARGE1. Collectively, these data shed light on how matriglycan is synthesized alongside the functional significance of glycosyltransferase oligomerization." @default.
• W4280498512 created "2022-05-22" @default.
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• W4280498512 date "2022-05-12" @default.
• W4280498512 modified "2023-09-25" @default.
• W4280498512 title "The homodimeric structure of the LARGE1 dual glycosyltransferase" @default.
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• W4280498512 doi "https://doi.org/10.1101/2022.05.11.491581" @default.
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